Vault and zip: what they have in common

1. Step 1. Vault — is part of — Gothic cathedral. Rib vaults.
2. Step 2. Gothic cathedral — works like — Steel frame. A skeleton system: the frame carries the load, freeing the walls for windows.
3. Step 3. Steel frame — has part — Rivet. Early frames were riveted.
4. Step 4. Rivet — is part of — Jeans. Copper rivets on the pockets.
5. Step 5. Jeans — has part — Zip. A zip.

Open Evothings